Electric axle drive for an at least partially electric motor vehicle having a switchable torque vectoring operation

Abstract

An electric axle drive for a motor vehicle includes a first electric engine, which has a first rotor, a second electric engine, which has a second rotor, and a differential transmission with three shafts. The first rotor can be coupled with the input shaft such that torques originating from the first rotor are introduced into the differential transmission via the input shaft. A first switch element is configured to couple the second rotor with the first output shaft such that torques originating from the second rotor are introduced into the first output shaft. A second switch element is configured to couple the second rotor with the second output shaft such that torques originating from the second rotor are introduced into the second output shaft.

The invention claimed is: 
     
       1. An electric axle drive for an at least partially electric motor vehicle, the electric axle drive comprising:
 a first electric engine having a first rotor; 
 a second electric engine having a second rotor; 
 a differential transmission comprising an input shaft, a first output shaft, and a second output shaft, wherein the first and second output shafts are configured to discharge torques from the differential transmission in a direction of motor vehicle wheels, wherein the first rotor is couplable with the input shaft such that torques originating from the first rotor are introduced into the differential transmission via the input shaft; 
 a first switch element configured to couple the second rotor with the first output shaft such that torques originating from the second rotor are introduced into the first output shaft while bypassing the input shaft and while bypassing the second output shaft; and 
 a second switch element configured to couple the second rotor with the second output shaft such that torques originating from the second rotor are introduced into the second output shaft while bypassing the input shaft and while bypassing the first output shaft; 
 a first planetary gear set arranged between the first output shaft and a first motor vehicle wheel of the motor vehicle wheels in relation to a torque flow; and 
 a second planetary gear set arranged between the second output shaft and a second motor vehicle wheel of the motor vehicle wheels in relation to the torque flow, 
 wherein the first electric engine and the differential transmission are arranged coaxially to each other and coaxially to a main axis of rotation, 
 wherein in relation to the main axis of rotation, the first switch element is arranged axially overlapping and radially surrounding the second switch element. 
 
     
     
       2. The electric axle drive of  claim 1 , further comprising:
 a third switch element configured to couple the second rotor with the input shaft such that torques originating from the second rotor are introduced into the differential transmission via the input shaft, wherein in relation to the main axis of rotation, the third switch element is arranged radially surrounding and axially overlapping the first switch element. 
 
     
     
       3. The electric axle drive of  claim 1 , wherein the first switch element and the second switch element are friction couplings. 
     
     
       4. The electric axle drive of  claim 1 , wherein in relation to the main axis of rotation, the first switch element and the second switch element are arranged axially between the differential transmission and the second electric engine. 
     
     
       5. The electric axle drive of  claim 2 , further comprising:
 a fourth switch element configured to connect the first rotor to the input shaft to concomitantly rotate. 
 
     
     
       6. The electric axle drive of  claim 5 , further comprising:
 a fifth switch element configured to connect the second rotor to an input side of the first switch element to concomitantly rotate. 
 
     
     
       7. The electric axle drive of  claim 1 , wherein the differential transmission has a sun gear, a double planetary carrier, and an annular gear, wherein the annular gear is connected to the input shaft to concomitantly rotate, the double planetary carrier is connected to the first output shaft to concomitantly rotate, and the sun gear is connected to the second output shaft to concomitantly rotate. 
     
     
       8. The electric axle drive of  claim 7 , wherein in relation to a direction of the main axis of rotation, the first output shaft, the sun gear, the first switch element, and the second electric engine are arranged one after the other in the recited order.